Drilling and tapping device.



PATENTED JUNE 19, 1906'. J. PBTRELLI. DRILLING AND TAPPING DEVICE.

APPLICATION I ILBD MAR.14,1905.

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mm; mmummcod rnoroqnnonmvums. WASHINGTON n a PATENTED JUNE 19, 1906.

J. PETRBLLI. DRILLING AND TAPPING DEVICE.

APPLICATION FILED MAR.14,1905.

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- plan view of UNITED STATES PATENT onnion Specification ofLettersPatent. Application-filed March 14,1905. Serial No- 250,042.

ratented June 19, 1906.

To all whom it may concern:

Be it known that I, Josnrn PETRELLI, a citizen Of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented anew and useful Improved Drilling and TappingDevice; and I do hereby declare the following;- when taken in connectionwith the accom panying drawings and the numerals of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, andrepresent, in

Figure 1, a view in side elevation of my improved drilling andtapping-device; Fig. 2,

a plan view thereof with the main portion of the stop-arm broken away;Fig. 3, a reverse plan view thereof; Fig. 4, a broken view of the devicein verticalsection; Fig. 5, a plan view of the device with thenon-rotatable gear, non-rotatable gear-collar, and stop-arm removed;Fig. 6, a reverse plan view of the non-rotatable gear, non-rotatablegear-collar, and stop-arm, the main portion of the latter being brokenaway; Fig. 7, a view thereof in side elevation; Fig. 8, a detached thecover, reversin -gear, and tap-spindle; Fig. 9, a detached p an view ofthe reversing-gear; Fig. 10, a sectional view on the line a b of Fig. 9;Fig. 11, a-detached view, in side elevation, of the clutch-collar; Fig.12, a plan view thereof; Fig. 13, a re-' verse plan view thereof; Fig.14, a detached lan view of the tap-spindle; Fig. 15, a liroken viewthereof in side elevation, showing its inner end and tang; Fig. 16, areverse plan view of the driving-pinion; Fig. 17, 'a view thereof inside elevation; ig. 18, a plan view of the driven pinion; Fig. 19, aview thereof in side elevation; Fig. 20 a detached view, in sideelevation, of the sleeve employed to couple the two pinions together; Fig.21., a detached view, in side elevation, showin the driving anddriven pinions as couple together by the said coupling-sleeve; Fig. 22,a corres onding view of the pinions and sleeve turne one-quarter turn,lockin rib on the driving-pinion.

My invention relates to an improved drilling and tapping deviceforlathes and drillpresses, the'object being to produce a cornpact,effective, and convenient device for doing drilling and tapping withoutresorting to a machine furnished with reverse-motion gearing.

convenient.

so as to show the sists in a drilling and tapping device having certaindetails of construction and combinations of parts, as will behereinafter described, and pointed out in the claims. 7

In carrying out my invention as herein shown I em loy a chambered case2, of flattened circu ar shape, formed with a hub 3, having a ta credconcentric opening A'for the reception 0 the tapered end of a stem 5,the other end of which is inserted into the .chuck or jaws or s indle ofany ordinary drill-press or lathe, w ereby the case is driven. The saidbody 2 is furnished with a circular platelike cover 6, secured in placeby screws 7, and formed with a central bearing-hole 8 for the receptionof atool-carrying spindle or driven shaft 9, which is both rotatable andlongitudinally movable therein. At its outer .end the said spindle isprovided with a chuck 10, consisting, I formed with a counterb ore 11and with .a setscrew 12. with a tap '13; but it 11 be understood, ofcourse, that the tap may be replaced by .a drill. As thereversing-gearing of the device is only brought into play when it isbeing used as a tapping device it seemed best to show a tap rather thana drill. The particular means carried by the spindle 9 for holdingdrills and taps may be varied, as found The spindle 9 also carries .onits projecting outer end a coupling-head 1 1, having ttwooppositely-extending couplingarms 15 15, the opposite faces of which.are cut awayforengagement withtwo oppositelylocated. couplin pins .16,projecting from the outer face 0 the cover 6 and located on oppositesides .of the bearing-hole 8 aforesaid. The said tap 13 is embraced bythe flattened fork 17 of a gage, having a long shank 18passing throughand adjustable inja clip 19, having an adjusting scre-w 20, and securedby a .clampingscrevv 21 uv on the stop-arm 22, which will bedescribedater on. As soon as the said fork 17 has been engaged by-the work themovement .of the lease 2 toward the work or the movement of the worktoward the case '2 is blocked, but the case continues to revolve,whereby-the screwthreads of theta 13 draw the same into the hole in thewor and .therefore draw the spindle 9, outward away from the said case,until at lengththe coupling-arms '15 are disengaged from thecoupling-pins 16, so that althoughthe case continues-to revolve rotaryWith these ends in view my invention conmotion is no longer imparted tothe tap.

As shown, the device is furnished as shown, of a cylindrical head,

IIO

The time has now come for reversing the tap, which is done by raisingthe spindle of the drill-press by the usual feed-lever, or by moving thespindle of the tail-stock of the lathe, as the case may be, until thereversinggearing of my improved device has been brought into play.

To provide for reversing the tap 13, I form -the 1nner end of thespindle 9 with a flattened tang 23, having a screw-hole 24. Over thistang I set a clutch-collar 25, having an oblong opening 26,corresponding to the crosssectional shape of the tang 23, which preventsthe collar from rotating with res set to the spindle. The outer end ofthe sai collar rests upon a shoulder 27, formed upon the spindle byproducing the tang 23, and the collar is held in place by means of ascrew 28 entering the screw-hole 24, the head of the screw entering theinner end of the collar and bearing u on two shoulders 29, formed withinthe co lar on opposite sides of its oblong opening 26 and produced bythe formation of t e same. The outer end of the said collar is reducedin diameter and formed with two 0ppositely-proj ecting coupling-lugs 30,arranged to engage (when brought into position by the outward movementof the clutch-collar with formed with a the tap-spindle) with a pair ofcoupling-pins 31, projecting inwardly into the circular opening of adriven reversing-gear 32 loosely mounted upon the inner end of thespindle 9 and bearing upon the inner face of the cover 6 aforesaid, thesaid gear being also furnished with a sleeve 33, entering a circularrecess 34 in the cover 6. To adapt the said gear 32 to receive the outerend of the collar 25 and provide clearance for the coupling-lugs 30, itis central recess 35, Fig. 10, into which the ins 31 aforesaid project.The bottom wall 36 of the recess 35 is engaged by the lower edges of thelugs 30 to limit the outward movement of the spindle. The said gear 32is housed within a central circular recess 37, extending into the case2, the inner face of the said gear engaging with the inner face 38 ofthis recess to hold the gear against inward displacement. A concentricrecess 39, leading out of the bottom of the recess 37,

formed upon its inner face receives the extreme inner end of the spindle9 The recess 39 in hole 4, receiving 5.

The reversing-gear 32 meshes into a driven pinion 40, corresponding toit in size and number of teeth, and housed in a chamber41,,corresponding to the chamber 37, but 10- cate at oneside thereof.The pinion 40 is with a locking-rib 42, enterlng a locking-slot 43,formed in the adjacent end of a coupling-sleeve 44, the opposite end ofwhich is formed with a slot 45, receiving a locking-rib 46, formed uponthe adjacent face of a relatively smaller drivingpinion 47, housed in achamber 48, formed in the opposite face of the case 2 from the saidchamber 41. The said chambers 41 and 48 are connected by a concentrichole 49 receiving the said coupling-sleeve 44. A couplingstud 50,passing through the pinion 47, through the sleeve 44, and the pinion 40,re ceives a retaining-screw 51, whereby the pinion 40, sleeve 44, andpinion 47 are coupled together to function as one piece, turning uponthe same axis. The said driving-pinion 47 meshes into anexternally-toothed annular fulcrum-gear 52, located in an annular recess53, formed in the case 2, encircling the foot of the hub 3 and openinginto the chamber 48 aforesaid, the said gear 52 being relatively largerthan the driven or reversing gear 32, with which it is concentric inarrangement. The said gear 52 has a sleeve 54 smaller than it is indiameter and fitting into a collar 55, in which it is held againstrotation by a screw 56, which, however, does not bind the collar andsleeve so tightly together but what one will slip upon the other so asto prevent breakage in case of any obstruction to the free working ofthe device. The screw 56 constitutes, therefore, not only abindingscrew, but also a safety device, and may be replaced by anyequivalent means for the urpose. The sleeve 54 fits snugly over the ub3, which turns within the sleeve as the case 2 rotates, the gear 52 andcollar being secured in place by means of a washer 57 e11- circling thesaid hub 3 and held in place by a set-screw 58. The collar 55 isprovided with an arm 59, having a threaded socket 60 receiving astop-arm 22, which extends radially outward and engages with some fixedobject, such as a part of the drill-press or the lathe or some otherfixed point.

It will be understood from the foregoing that as the case is rotatedforwardly the driving-pinion 47 and the driven pinion 48, which rotatetogether on the same axis, revolve planetwise with the said case aroundthe gears 52 and 32, into which they are respectively meshed, wherebythe gear 32 is retated in a reverse direction from the case 2 by thesaid pinions which are actuated in rotation by the riding of the drivenpinion 47 over the gear 52, which by being normally held againstrotation constitutes a oint of purchase for the actuation of the saireversing-gear 32, which is always turning in the reverse direction fromthe case. Now whenever the spindle is moved outward, not only far enoughto uncouple it from the cover 6, but also to bring its lugs 30 intoengagement with the pins 31 of the said gear 32, then the said ear willimmediately begin to rotate the spinrTle in the opposite direction fromthe direction in which the case is moving, whereby the tap carried bythe spindle wi 1 be backed out, so to speak, from the hole in which ithas been cutting.

It is apparent that in carrying out my in- LII . into the vention somechanges from the construction herein shown and described may be made.

would therefore have it understoodthat I do not limit myself thereto,but hold myself at liberty to make such departures therefrom as fairlyfall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a drilling and tapping device, the combination with a rotatablecase, of a toolcarrying spindle, an externally-toothed fulcrum-gear anda driven gear difierentiated from each other in size and concentric withthe said case and spindle, a driving-pinion and a driven piniondifferentiated in size, rotating on the same axis, meshing directlyfulcrum and driven gears respectively, and revolved planetwise aroundthe same with the case, and means for coupling the said spindle with thecase for its rotation therewith and for coupling the said spindle withthe said driven gear for its reverse rotation thereby.

2. In a drilling and tapping device, the

combination with a rotatable case, of a toolcarrying spindle, anexternally-toothed ful- 'around the same with the crum-gearconcentric-with the said case and spindle, a relatively smaller drivengear concentric with the said case and spindle, a driving-pinion and arelatively larger driven pinion rotating together on the same axis,meshing directly into the said fulcrum and driven gears respectively andrevolved planetwise case, and means for coupling the spindle with thecase forits rotation therewith and for coupling the spindle with thedriven gear for its reverse rota tion thereby.

3. In a drilling and tapping device, the combination with a rotatablecase, of a longitudinally-movable tool-carrying spindle arranged to becoupled with the said case, an externally-toothed fulcrum-gearconcentric with the said case and spindle, a driven gear concentric withthe said case and spindle and having a central opening through which thespindle extends u ward into the case, a driving-pinion and a rivenpinion differentiated in size, rotating on the same axis, meshingdirectly into the fulcrum and driven gears respectively and revolvedplanetwise around the same, and a clutch-collar n'on-rotatably connectedwith the upper end of the spindle and adapted to be engaged with thesaid driven gear for the rotation of the spindle ternally toothedthereby.

- 4. In a drilling and ta ping device, the combinationwith arotatab ecase, of alongitudinally-movable tool-carrying 7 spindle arranged to becoupled with the said case, an exfulcrum a gear concentrlc with the saidcase and spindle, a driven gear adapted to be coupled with concentricwith the said case and spindle and having a circular central openingthrough which the spindle extends upward into the case, coupling-pinscarried by the said driven gear and projecting into the central openingthereof, a drivinginion and a driven pinion differentiated in slze,rotating on the same axis, meshing directly into the said fulcrum anddriven gears respectively and revolved planetwise around the same withthe case, a clutch-collar non-rotatably' connected with the upper end ofthe sald spindle and adapted to be entered atits lower end into the saidopening in the driven gear, and coupling-pins carried by the saidclutch-collar and engaging with the coupling-pins carried by the saiddriven gear for coupling the spindle with the driven gear by which it isrotated.

5. In a drilling and tapping device, the combination with a rotatablecase, of a longitudinally-movable toolcarrying spindle arranged to becoupled with the said case, an externally-toothed fulcrum-gearconcentric with the said case and spindle, a driven gear concentric withthe said case and spindle and having a central opening through which thespindle extends upward lnto thecase, a driving-pinion and a drivenpinion difierentiated in size, rotating on the same axis, meshingdirectly into the fulcrum and driven gears respectively and revolvedplanetwise around a clutch-collar fitted the said spindle and the saiddriven gear, and a screw entering the upper end of the saidclutch-collar on which it has bearing and also entering the upper end ofthe said spindle, whereby the collar is secured in place against endwisemovement.

6. In. a drilling and ta ping device, the combination with a rotatab echambered case having a cover, of, a tool-carrying spindle entering thecase through thecover, an externally-toothed fulcrum-gear and a drivengear difierentiated from each other in size and concentric with the saidcase and spindle which latter passes through the driven t e same withthe case, over the upper end of gear, a driving-pinion and a drivenpinion differentiated 1n size, rotating on the same axis, meshingdirectly into the fulcrum and driven gears respectively and revolvedplanetwise around the same with the case the cover of which closes inthe said driven gear and driven pinion, and means for coupling thespindle with the case for its rotation therewith and for coupling thespindle with the driven gear for its reverse rotation thereby.

7. In a drilling and tapping device, the combination with a rotatablecase, of a longitudinally-movable tool-carrying spindle arranged to becoupled with the said case and having a flattened tang at its upper end,an externally-toothed fulcrum-gear concentric with the said case andspindle, a driven gear concentric with the said case and spindle andWith and disengaged from the said driven having a circular centralopening through gear by means of Which the spindle is rotated. which thespindle projects upward into the In testimony whereof I have signed thiscase, a driving-pinion and a driven pinion specification in the presenceof two subscrib- 5 differentiated 1n size, rotating on the same ingWitnesses:

axis, meshing directly into the fulcrum and driven gears res ectivelyand revolved planetWise around tlie same, and a clutch-collarWVitnesses: applied to the upper end of the said spindle CLARA L. WEED,l a over the said tang and adapted to be engaged GEORGE D. SEYMOUR.

JOSEPH PETRELLI.

